GB2165720A - Dynamic speaker - Google Patents

Dynamic speaker Download PDF

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Publication number
GB2165720A
GB2165720A GB08519349A GB8519349A GB2165720A GB 2165720 A GB2165720 A GB 2165720A GB 08519349 A GB08519349 A GB 08519349A GB 8519349 A GB8519349 A GB 8519349A GB 2165720 A GB2165720 A GB 2165720A
Authority
GB
United Kingdom
Prior art keywords
annular
transducer device
plate
dynamic transducer
circular plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08519349A
Other versions
GB8519349D0 (en
GB2165720B (en
Inventor
Mutsuo Hirano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanden Holdings Corp
Original Assignee
Sanden Holdings Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP59184197A priority Critical patent/JPH0478079B2/ja
Priority to JP620385U priority patent/JPS61124183U/ja
Application filed by Sanden Holdings Corp filed Critical Sanden Holdings Corp
Publication of GB8519349D0 publication Critical patent/GB8519349D0/en
Publication of GB2165720A publication Critical patent/GB2165720A/en
Application granted granted Critical
Publication of GB2165720B publication Critical patent/GB2165720B/en
Application status is Expired legal-status Critical

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02Details
    • H04R9/025Magnetic circuit
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
    • H04R1/24Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/027Electrical or mechanical reduction of yoke vibration
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00Loudspeakers
    • H04R2400/03Transducers capable of generating both sound as well as tactile vibration, e.g. as used in cellular phones

Description

1 GB 2 165 720 A 1

SPECIFICATION

Dynamic transducer device The present invention relatesto dynamic transducer devices and, in particular, to a dynamic speaker device which is a small type butcan reproduce a vibration of a frequency lowerthan about 250 Hz, more particularly about 100 Hz or less, as well as a higherfrequency band.

A known dynamicspeaker comprises a magnetic assembly having a permanent magnet and a magnetic yoke with a magnetic gap. Avoice coil is disposed in the magnetic gap. A vibrating plate of, usually, a cone shape is mechanically connected to the voice coil. The vibrating plate is elastically supported byspring means. When an audio signal is fed to the voice coil, the coil axially reciprocates according to the amplitude and frequency of the audio signal. Accordingly, the vibrating plate vibrates and reproduces the sound.

Generally speaking, a speaker having a vibrating plate of a smaller diameter cannot reproduce a lower sound brvibration because the vibrating amplitude is limited atthe lowerfrequency.

In a known audio system, speakers of a small diameter and a large diameter are often used.

In anothersystern which reproduces from an electric audio signal not only sound felt by ear but also vibration of, preferably, undertones lowerthan about 150 Hzto be directly transmitted to a body, an electromechanical vibrator is used for reproducing the mechanical vitration in addition to sound speakers, as disclosed in U.S. patent No. 4,064,376.

The use of two speakers of different sizes orthe vibrator in addition to the speaker results in an increased size of an apparatus, fabric, or instrumentto which theyare assembled.

It is an object of the present invention to provide a dynamic transducer device which can reproduce vibration of a frequency band lowerthan about 250 Hz, especially 150 Hz or less, as well as sound of the higher frequency.

Itis another object of the present invention to provide such a dynamic transducer device which is small in size and simple in construction and assembling.

According to the present invention a dynamic cylinder.

The support means may comprise a support rod and a spring platefixedly mounted thereon, the annular coil housing orthe annular plate being joined to the spring plate et equiangularly-spaced positions.

Since the additional coil is also disposed in the magnetic field generated by the permanent magnet, supply of an audio signal to the additional coil results in vibration of the additional coil. Accordingly, the vibrating body vibrates together with the additional coil.

In this construction, the lowerfrequency vibration can be generated from the vibrating bodybythefact thatthetotal amount of weight of the vibrating body, thespring plate, and the additional coil isdesignedto be comparatively large, and/orthat the mechanical resistance andlor stiffness of the spring plate is selected to be comparatively large.

The invention will nowbedescribed, bywayof example,with reference to the accompanying drawings, in which;- Fig. 1 is a sectional view of an embodiment of the present invention; Fig. 2 is a rearview of a vibrating assembly of the embodiment; Fig. 3 is a sectional view of a main part of the embodiment, illustrating magneticfield generated by a permanent magnet in the embodiment; Fig. 4 is a sectional view of a modification of the embodiment; Fig. 5 is a sectional viewof another embodiment of the present invention; Fig. 6 is a sectional view of a modification of embodiment of Fig. 5; Fig. 7 is a sectional view of still another embodiment of the present invention; Fig. 8 is a sectional view of a main part of the embodimentof Fig. 7, illustrating magneticfield produced by a magnetic assembly in the embodiment of Fig. 7;

Fig. 9 is a rearview of the vibrating assembly in the embodiment of Fig. 7, but a different spring plate being used; Fig. 1 Oa is a view illustrating an outputfrequency response of the vibrating assembly in Fig. 7, for an input audio signal of 1 w; Fig. 1 Ob is a view illustrating an outputfrequency response of the vibrating assembly in Fig. 9, for an input audio signal of 1 w; transducer device comprises a magnetic assembly having a permanent mag net and a magnetic yoke with a magnetic gap, a voice coil disposed in said magnetic Fig. 11 a is a view illustrating a frequency response gap, an additional coil disposed in the vicinity of said similarto Fig. 1 Oa, butfor an input audio signal of 5 w; magnetic assembly, a vibrating body mechanically Fig. 11 b is a view illustrating a frequency response connected to, and supporting, said additional coil, and 115 similarto Fig. 1 Ob, butfor an input audio signal of 5 w; support means elastically supporting said vibrating body.

Thevibrating body may be an annular magnetic coil housing, in which the additional coil is mounted.

Suitably,the magneticyoke is provided with an additional magnetic gap, in which the additional coil is disposed in the additional magnetic gap. The vibrating bodythen comprises an annular plate and a cylinder fixed thereon. The additional coil is mounted on the and Fig. 12 is a rearview of a modification of Fig. 9.

Referring to Fig. 1, a speaker device according to an embodiment of the present invention comprises a known speaker assembly 10 and an additional vibrating assembly 20.

Speaker assembly 10 includes a magnetic assembly comprising an annular permanent magnet 101 and a magnetic yoke 102. The magneticyoke comprises a The drawings originally filed were informal and the print here reproduced is taken from a later filed formal copy.

2 GB 2 165 720 A 2 circularplate portion 102a, a centerpole portion 102b mounted on thecenterof circularplate portion 102a, and an annular plate portion 102c having a center hole. Permanent magnet 101 is mounted on circular plate portion 102a, and annular plate portion 102c is mounted on permanent magnet 101. Centerpole 102b extendsthrough a hollow portion of permanent magnet 101. The extended end is inthe center hole of annular plate portion 102cto remain a small annular magneticgap 103 between the outersurfaceof the extended end and the innersurface of the central hole.

Avoice coil 104 isdisposed in magnetic gap 103, and is mounted on a cylindrical bobbin 105. Bobbin 105 is supported by a centering device or a spider 106 which is connected to a frame 107. A numeral 108 represents a buffle plate. Avibrating plate, which is usually a cone 109, is supported to frame 107 atthe outer peripheral end, and is connected to bobbin 105 atthe central portion. 20 Voice coil 104 is connected to electric lead wires 110 which are connected to an amplifier (not shown) for supplying an audio signal. The above-described arrangement is well known as a dynamic speaker. When an audio sig nal is supplied to voice coil 104 th rough lead wires 110, voice coil 104 reciprocates and drives vibrating plate 109 to reproduce sound as well known in the prior art.

In this connection, there is a relationship between the diameter of the vibrating plate 109 and the reproducable f requency. The smallerthe diameter is, the higher the reproducable f requency is. Therefore, a speaker of a small size cannot reproduce the lower frequency sound and vibration.

The present invention attempts to add an additional vibrating assemblyto the known speaker assembly of 100 a small size so as to enable to reproduce the lower frequency sound and vibration.

According to the present invention, the embodimentof Fig. 1 is provided with the additional vibrating assembly 20. The vibrating assembly comprises an additional coil 201 having a comparatively many turns. The additional coil is mounted in an annular magnetic coil housing 202. The coil housing has a "U" shape in a section and is made of iron to have a comparatively large weight.

The additional coil 201 and coil housing 202 are disposed opposite to, and adjacentto, the back surface of circular plate portion 102a of speaker assembly1O.

A spring plate 203 of, for example, phosphor bronze 115 is joined to the bottom plate of "U" of annular housing 202 at equiangular-spaced positions. The spring plate comprises a center circular plate 203a, a concentric outer annular plate 203b, and a plurality of radial beams 203c, as shown in Fig. 2. The radial beams bridge between the equiangularly-spaced positions of the outer end of centercircular plate 203a and the inner end of outer annular plate 203b to connectthe center plate 203a and outer annular plate 203b together. The outer annular plate 203b is joined to the bottom portion of the annular housing 202 at equiangularly-spaced positions by,for example, rivets 204.

The spring plate 203 is fixedly mounted on one end of a support rod 205. That is, central circular plate 203a has a central hole in which an end screw portion 205a of support rod 205 is inserted, with a nut 206 being fastened to screw portion 205a.

Support rod 205 extends through a hollow of annular coil housing 202, and the extended end is fixedly mounted to a center of the circular plate portion 102a of the magnetic yoke, so thatthe coil 201 is disposed adjacent the circular plate portion 102a.

Additional coil 201 is connected to lead wires 110 by its leads 207 so as to be in paral lel with the voice coil 104.

According to the arrangement, additional coil 201 is within a magneticfield of magneticfluxes 01 leaking from magnetic assembly 101-102 of speakerassembly 10, asshown in Fig. 3. In thefigure, 02 represents magneticfluxes produced in magneticgap 103.

When the audio signal is applied to additional coil 201, the additional coil receives electromagnetic force to vibrate together with coil housing 202 and spring plate 203.03 is magneticfluxes generated by electric currentflowing through the additional coil.

Sincethe winding number of the additional coil 201, the weight of additional coil 201, coil housing 202 and spring plate 203, stiffness of spring plate 203 are large in comparison with voice coil 104, cone 109 and spider 106 in speaker assembly 10, the additional coil and the coil housing vibrate atthe lowerfrequency. Therefore, the lowerfrequency sound and vibration are reproduced atthe vibrating assembly.

It is not necessary thatthe diameters of the coil 201 and coil housing 202 are made largerthan the cone 109 of the speaker assembly.

Thus, the speaker device of a small size of the present invention can reproduce the lowerfrequency sound and vibration as well asthe higherfrequency sound.

It is not necessary thatthe vibrating assembly 20 directly mounted on the speaker assembly 10, butthe former should befixedly disposed adjaceritto the latter so thatthe additional coil 201 is electromagneti- cally coupled to the magnetic assembly 101 -102 of the speaker assembly.

Referring to Fig. 4, the vibrating assembly 20 is fixedly mounted within a speaker box 30 in which a speaker 10 is mounted. Thus, the vibrating assembly 20 is electromagnetically coupled to the speaker 10, and therefore, the lower frequency sound can be reproduced atthe vibrating assembly.

Referring to Fig. 5, a permanent magnet 208 can be additionally disposed adjacentto additional ctil 201, so thatthe additional coil 202 is advantageously placed within a static magneticfield of an increased magnetic strength.

The additional permanent magnet 208 is also supported on support rod 205.

Referring to Fig. 6, the additional permanent magnet 208 can be fixedly mounted in speaker box 30 in which the speaker device with the vibrating assembly is mounted, as shown in the figure.

Referring to Fig. 7, another embodiment shown therein is generally similarto the embodiment of Fig. 1 but an arrangementfor electromagnetically coupling the additional coil with the magnetic assembly in the speaker assembly.

The similar parts are represented by the same reference numerals as in Fig. land detailed descrip- 3 GB 2 165 720 A 3 tionthereto is omittedforthe purposeof simplification of the description.

In the present embodiments, annular plate portion 102c of magnetic yoke is extended outwardly, and the extended portion is bent rearwardly as shown at 102d in Fig. 7. The bent portion 102d is further bent inwardly, and the inwardly-bent portion 102e extends towards the outer end of circular plate portion 102a of magneticyoke 102 so asto form an additional magnetic gap 111 between the inner end of the inwardly-bent portion 102e and the outer end of the circular plate portion 102a.

An additional coil 20Vis formed in a shape similarto voice coil 104. The additional coil 20Vis fixedly mounted on a cylindrical bobbin 209 and is disposed in the additional magnetic gap 111.

Bobbin 209 isjoined to an annular vibrating plate element 210 which is made of, for example, iron and has a comparatively large weight.

Vibrating plate element 210 isjoined to spring plate 203 by rivets 204 similarto Figs. 1 and 2. The spring plate is similarly supported on support rod 205 which isfixedly mounted on circular plate portion 102a of the magneticyoke.

In the arrangement, magneticfluxes flowthrough annular plate portion 102c, rearwardly-bent portion 102d, inwardly-bent portion 102e, additional magnetic gap 111, and circular plate portion 102a. Therefore, the additional coil 20Vis exposed in a magneticfield of an increases strength. Accordingly,the vibrating amplitude of the coil 201'and vibrating plate element 210 is largerthan that of the coil 201 and the coil housing 202 in Fig. 1 under condition that current signals applied to respective coils 201'and 201 are equal to one another.

Fig. 9 shows anotherspring plate 203'which is used in place of spring plate 204 as shown in Fig. 2.

Referring to Fig. 9, the spring plate 203'comprises a central circular plate portion 203'a which is fixedly supported atthe centerto support rod 205 by nut 206. 105 A plurality of fingers 203% (fourfingers are shown) extend outwardlyfrom equiangularly-spaced posi tions on the outer peripheral end of the central circular plate portion 203'a. Fingers 203'b arefurther bentto extend concentrically as shown at203'c in thefigure, 110 around central circular plate portion 203'a. The concentrically-extended ends arejoined to vibrating plate element 210 by rivets 204 at equiangularly spaced positions.

In the arrangement, a distancefrom the central 115 circular plate portion 203a to rivet portion 204 along each finger is largerthan each beam 203c in Fig. 2.

Therefore, the vibrating plate element 210 can smoothlyvibrate at an increased amplitude, as well as the vibrating frequency band is enlarged. 120 An input signal of 1 Wwas applied to additional coil 20Vin the device of Fig. 7 where the spring plate 203 of Fig. 2 is used. Frequency characteristic of the output vibration was measured as shown in Fig. 1 Oa. It will be understood from Fig. 1 Oa, thatthe outputvibration is 125 especially strong at a frequency of about80 Hz.

The spring plate 203'of Fig. 9 was used in place of spring plate 203 and a frequency characteristic was measured. The measured data is shown in Fig. 1 Ob. In this case, there are four peaks at about 45 Hz, 60 Hz, 130 Hzand 200 Hz,which have generally equal levels.

Foran increased input power of 5 W, a characteristic of Fig. 11 a was obtained in use of spring plate of Fig. 2, while a characteristic of Fig. 11 b was observed in use of spring plate of Fig. 9.

Comparing Fig. 11 a and Fig. 11 b, itwill be understood that, although a vibration of a frequency of 80 Hz is quite strongerthan the other frequencies in use of spring plate of Fig. 2, the use of spring plate of Fig. 9 unifys the vibrating levels atvarious frequencies from about30 Hzto about 250 Hz.

Referring to Fig. 12, a modification of the spring plate of Fig. 9 is shown. In Fig. 9, each finger 203'b extends from central circular plate 203a in a direction of a diameter of the circular plate.

In comparison with this, each finger 203'b extends from the central circular plate 203'a in a direction of a chord offsetfrom the center of the central circular plate. In the arrangement,the vibrating energy of fingers 2031 is distributed overthe entirety of the central circular plate 203'a without concentrating to the centerthereof. As a result, the outputvibration is more unified overthe wide frequency band.

Itwill be noted that spring plates of Figs. 9 and 12 can be used in the device of not only Fig. 7 but also Fig. 1.

Each spring plate of Figs. 2,9 and 12 is made of phosphor bronze, but it can be formed of a synthetic resin plate reinforced by a carbon fibers. For example,

Claims (20)

a cloth molded plate can be usedwherein a carbonfiber cloth is molded bythe synthetic resin such as epoxy resin. Alternatively, carbonfibers are mixed into plastic resin materials and the spring plate can be formed by an injection molding. 100 CLAIMS
1. A dynamic transducer device comprising a magnetic assembly having a permanent magnet and a magnetic yoke with a magnetic gap, a voice coil disposed in said magnetic gap, an additional coil disposed in the vicinity of said magnetic assembly, a vibrating body mechanically connected to, and supporting, said additional coil, and support means elastically supporting said vibrating body.
2. The dynamic transducer device as claimed in claim 1, wherein said vibrating body is an annular body having a central bore, said additional coil being disposed coaxial with said annularvibrating body, said support means comprising a support rod and a spring platefixedly mounted on said support rod, said annular vibrating body being jointed to said spring plate at equiangularly-spaced positions.
3. The dynamictransducer device as claimed in claim 2, wherein said support rod extends through the central bore of said annular vibrating body, and the extended end is fixedly mounted onto said magnetic yoke.
4. The dynamic transducer device as claimed in claim 3, wherein said magnetic yoke is provided with an additional annular magnetic gap, and said additional coil is disposed in said additional magnetic gap.
5. The dyamic transducer device as claimed in Claim 4, wherein said annular vibrating body comprisesan annular plate and a coaxial cylindrical member fixed to said annular plate atone end, said additional coil being mounted on an outer surface of the other 4 end portion of said cylindrical member.
6. The dynamic transducer device as claimed in Claim 4, wherein said magnetic yoke comprises a circular plate portion, a center pole mounted on the centerof said circular plate portion, and an annular plate portion having a central hole, said canter pole being in said central hole so thatsaid annular gap is formed between the outersurface of said central pole and the inner end ofsaid annular plate portion, said annular plate portion having an extending portion extending outwardly, said extending portion being berittowards said circular plate portion and further bent inwardlytowards the outerend of said circular plate portion, said additional annular magnetic gap being formed between the outer end of said circular plate portion and said inwardly bent portion.
7. The dynamic transducer device as claimed in Claim 2, wherein said annular vibrating body is an annular magnetic coil housing, and said additional coil is mounted within said coil housing.
8. The dynamic transducer device as claimed in Claim 7, wilirh further comprises an additional annular permanent magnet fixedly disposed adjacent said additional coil.
9. The dynamictransducer device as claimed in Claim 7 or8, wherein said support rod extends through a central bore of said coil housing, and the extended end is fixedly mounted onto said magnetic yoke.
10. The dynamic transducer device as claimed in Claim 8, wherein said additional permanent magnet is coaxial ly and fixedly mounted on said support rod.
11. The dynamic transducer device as claimed in Claim 10, wherein one end of said support rod is fixedly mounted on said magnetic yoke, said permanent magnet being supported on the otherend of said support rod, and said spring plate being supported on the outersurface of said support rod.
12. The dynamic transducer device as claimed in Claim 2, wherein said spring plate comprises a center circular plate element, a concentric outer annular plate element, and a plurality of radial beam elements bridging between the outer end of said center circular plate element and the inner end of said outer annular plate element so that the center and outer elements are connected atequiangularly spaced position, said outer annular plate element being jointed to said annularvibrating body.
13. The dynamic transducer device as claimed in Claim 2, wherein said spring plate comprises a central circular plate element and a plurality of finger element extending outwardly from equiangularly-spaced positions on the outer peripheral end of said central circular plate element, said finger elements being bent to extend concentrically around said central circular elements, and the concentrically extended ends being jointed to said annular vibrating body.
14. The dynamic transducer device as claimed in Claim 13, wherein each of said finger elements extends from said central circular plate in a direction of a diameter of said circular plate, and is beritto extend concentric with said circular plate.
15. The dynamic transducer device as claimed in Claim 13, wherein each of said finger elements extends from said central circular plate in a direction GB 2 165 720 A 4 of a chord offsetfrom the centerof said circular plate, and is bent to extend concentric with said circular plate.
16. The dynamic transducer device as claimed in Claim 2, wherein said spring plate is made of phosphorbronze.
17. The dynamic transducer device as claimed in Claim 2, wherein said spring plate is made of a synthetic resin plate reainforced by carbon fibers.
18. The dynamic transducer device as claimed in Claim 1, wherein said vibrating body is made of iron.
19. The dynamic transducer device as claimed in Claim 1, wherein said additional coil is electrically connected to said voice coil in parallel with one another.
20. A dynamic transducer device constructed, arranged and adapted to operate substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawings.
Printed in tile United Kingdom for Her Majesty's Stationery Office, 8818935, 4186 1 8996. Published at the Patent Office, 25 Southampton Buildings, London WC2A lAY, from which copies may be obtained.
GB08519349A 1984-09-03 1985-08-01 Dynamic speaker Expired GB2165720B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP59184197A JPH0478079B2 (en) 1984-09-03 1984-09-03
JP620385U JPS61124183U (en) 1985-01-22 1985-01-22

Publications (3)

Publication Number Publication Date
GB8519349D0 GB8519349D0 (en) 1985-09-04
GB2165720A true GB2165720A (en) 1986-04-16
GB2165720B GB2165720B (en) 1988-04-20

Family

ID=26340285

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08519349A Expired GB2165720B (en) 1984-09-03 1985-08-01 Dynamic speaker

Country Status (5)

Country Link
US (1) US4720868A (en)
AU (1) AU580794B2 (en)
DE (1) DE3527501A1 (en)
FR (1) FR2569929B1 (en)
GB (1) GB2165720B (en)

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Also Published As

Publication number Publication date
GB2165720B (en) 1988-04-20
AU580794B2 (en) 1989-02-02
DE3527501A1 (en) 1986-03-13
AU4564485A (en) 1986-03-13
GB8519349D0 (en) 1985-09-04
FR2569929B1 (en) 1989-06-30
US4720868A (en) 1988-01-19
FR2569929A1 (en) 1986-03-07

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